User guide

Setting up the Instrument
9
Synchronizing the Pattern
Open the Pattern Sync
Setup dialog box.
1
Make sure that Normal
Sync Mode and
Automatic Sync are
selected.
2
Now make sure that the error detector
automatically syncs to the data pattern:
If sync fails, the sampling point is probably outside
of the eye. You should proceed with setting the
sampling point anyway. As soon as the instrument
finds the eye, with the settings we just made, it will
automatically synchronize the patterns.
Setting the Sampling Point
Switch to the
Sampling Point Setup.
1
Now set the optimum sampling point:
Press the Auto Align button
to measure the eye diagram
and to position the sampling
point at the center of the eye.
This usually takes about
10 seconds.
2
The BER indicator in the top left
corner displays the current BER
at this sampling point which
should be 0 for this test.
Setting up the Instrument
9
Selecting the Error Ratio Mode
Open the Error Ratio window.
1
Select the error ratio mode
from the provided options.
2
If you select the error ratio
based on
se the
drop-down list to specify
whether you want to see the
8B/10B Symbol Comparison
results as SER/FER/cBER/
FSR/DER/ISR.
8B/10B Symbol
Comparison, u
Now you can select error ratio based on
Bit 8B/10B Symbol Comparison,
or Bit Comparison without PCIe3 SKPOS.
Comparison,
Setting the Sampling Point
Switch to the
Sampling Point Setup.
1
Now set the optimum sampling point:
Press the Auto Align button
to measure the eye diagram
and to position the sampling
point at the center of the eye.
This usually takes about
10 seconds.
2
The BER indicator in the top left
corner displays the current BER
at this sampling point which
should be 0 for this test.
Synchronizing the Pattern
Open the Pattern Sync
Setup dialog box.
1
Make sure that Normal
Sync Mode and
Automatic Sync are
selected.
2
With this setting, the error detector
starts synchronizing when the BER
exceeds a certain threshold value.
You can see when it has synchronized
when the Sync Loss indicator goes off.
Now make sure that the error detector
automatically syncs to the data pattern:
If sync fails, the sampling point is
probably outside of the eye. You should
proceed with setting the sampling point
anyway. As soon as the instrument finds
the eye, with the settings we just made,
it will automatically synchronize
the patterns.
3
Before selecting the 8B/10B
Symbol Comparison, you must
ensure to load the user patterns
that contain valid 10B symbols.
2
3
2
Bit Comparison without PCIe3 SKPOS option
is only applicable for PCI Express 3.0 Testing.